Hello Anon The use of "whom" in an independent clause is grammatically wrong. Combine the last two sentences into one like : "Between 1939 and 1945 the SS systematically killed at least 11 million people, more than 5 million of whom were Jews". Another point that sounds odd to me is the verb "decided".
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DavkettIn addition to Paco's suggestions, consider this:
In the early 1930's, Germany was suffering from economic recession. By declaring that Germany's problems were caused by the Jewish people, Adolph Hitler instilled in the German people a fear of the Jews. Between 1939 and 1945, the SS systematically killed at least 11 million people